↑All JavaScript frameworks can be written in an accessible way with graceful degradation, frameworks seen here which imply out-of-the-box accessibility have made a special effort to document best practices for their particular framework.

↑JavaScript frameworks currently only have the ability to support offline storage by taking advantage of pre-installed browser extensions such as Google Gears. If a user does not have one of these supported extensions installed in their browser already then offline support will be unavailable to the framework. JavaScript framework developers interested in implementing Gears may want to start with the Gears Getting Started Guide.

↑Some JavaScript libraries provide 2d graphics primitives that can be used for cross-browser vector graphics. These libraries rely on underlying technologies in the browser or plugins such as Canvas, SVG, VML, Flash, and Silverlight to do the actual rendering, but help isolate application and widget code from the rendering engine API differences